#!/usr/bin/env python
# ex:ts=4:sw=4:sts=4:et
# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
#
# Copyright (c) 2013, Intel Corporation.
# All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# DESCRIPTION 'wic' is the OpenEmbedded Image Creator that users can
# use to generate bootable images.  Invoking it without any arguments
# will display help screens for the 'wic' command and list the
# available 'wic' subcommands.  Invoking a subcommand without any
# arguments will likewise display help screens for the specified
# subcommand.  Please use that interface for detailed help.
#
# AUTHORS
# Tom Zanussi <tom.zanussi (at] linux.intel.com>
#

__version__ = "0.2.0"

# Python Standard Library modules
import os
import sys
import optparse
import logging
from distutils import spawn

# External modules
scripts_path = os.path.abspath(os.path.dirname(__file__))
lib_path = scripts_path + '/lib'
sys.path.append(lib_path)

bitbake_exe = spawn.find_executable('bitbake')
if bitbake_exe:
    bitbake_path = os.path.join(os.path.dirname(bitbake_exe), '../lib')
    sys.path.append(bitbake_path)
    from bb import cookerdata
    from bb.main import bitbake_main, BitBakeConfigParameters
else:
    bitbake_main = None

from wic.utils.oe.misc import get_bitbake_var, BB_VARS
from wic.utils.errors import WicError
from wic import engine
from wic import help as hlp

def rootfs_dir_to_args(krootfs_dir):
    """
    Get a rootfs_dir dict and serialize to string
    """
    rootfs_dir = ''
    for key, val in krootfs_dir.items():
        rootfs_dir += ' '
        rootfs_dir += '='.join([key, val])
    return rootfs_dir.strip()

def callback_rootfs_dir(option, opt, value, parser):
    """
    Build a dict using --rootfs_dir connection=dir
    """
    if not type(parser.values.rootfs_dir) is dict:
        parser.values.rootfs_dir = dict()

    if '=' in value:
        (key, rootfs_dir) = value.split('=')
    else:
        key = 'ROOTFS_DIR'
        rootfs_dir = value

    parser.values.rootfs_dir[key] = rootfs_dir

def wic_create_subcommand(args, usage_str):
    """
    Command-line handling for image creation.  The real work is done
    by image.engine.wic_create()
    """
    parser = optparse.OptionParser(usage=usage_str)

    parser.add_option("-o", "--outdir", dest="outdir",
                      help="name of directory to create image in")
    parser.add_option("-e", "--image-name", dest="image_name",
                      help="name of the image to use the artifacts from "
                           "e.g. core-image-sato")
    parser.add_option("-r", "--rootfs-dir", dest="rootfs_dir", type="string",
                      action="callback", callback=callback_rootfs_dir,
                      help="path to the /rootfs dir to use as the "
                           ".wks rootfs source")
    parser.add_option("-b", "--bootimg-dir", dest="bootimg_dir",
                      help="path to the dir containing the boot artifacts "
                           "(e.g. /EFI or /syslinux dirs) to use as the "
                           ".wks bootimg source")
    parser.add_option("-k", "--kernel-dir", dest="kernel_dir",
                      help="path to the dir containing the kernel to use "
                           "in the .wks bootimg")
    parser.add_option("-n", "--native-sysroot", dest="native_sysroot",
                      help="path to the native sysroot containing the tools "
                           "to use to build the image")
    parser.add_option("-p", "--skip-build-check", dest="build_check",
                      action="store_false", default=True, help="skip the build check")
    parser.add_option("-f", "--build-rootfs", action="store_true", help="build rootfs")
    parser.add_option("-c", "--compress-with", choices=("gzip", "bzip2", "xz"),
                      dest='compressor',
                      help="compress image with specified compressor")
    parser.add_option("-v", "--vars", dest='vars_dir',
                      help="directory with <image>.env files that store "
                           "bitbake variables")
    parser.add_option("-D", "--debug", dest="debug", action="store_true",
                      default=False, help="output debug information")

    (options, args) = parser.parse_args(args)

    if len(args) != 1:
        logging.error("Wrong number of arguments, exiting\n")
        parser.print_help()
        sys.exit(1)

    if options.build_rootfs and not bitbake_main:
        logging.error("Can't build roofs as bitbake is not in the $PATH")
        sys.exit(1)

    if not options.image_name:
        missed = []
        for val, opt in [(options.rootfs_dir, 'rootfs-dir'),
                         (options.bootimg_dir, 'bootimg-dir'),
                         (options.kernel_dir, 'kernel-dir'),
                         (options.native_sysroot, 'native-sysroot')]:
            if not val:
                missed.append(opt)
        if missed:
            print "The following build artifacts are not specified:"
            print "  " + ", ".join(missed)
            sys.exit(1)

    if options.image_name:
        BB_VARS.default_image = options.image_name
    else:
        options.build_check = False

    if options.vars_dir:
        BB_VARS.vars_dir = options.vars_dir

    if options.build_check:
        print "Checking basic build environment..."
        if not engine.verify_build_env():
            print "Couldn't verify build environment, exiting\n"
            sys.exit(1)
        else:
            print "Done.\n"

    bootimg_dir = ""

    if options.image_name:
        if options.build_rootfs:
            argv = ["bitbake", options.image_name]
            if options.debug:
                argv.append("--debug")

            print "Building rootfs...\n"
            if bitbake_main(BitBakeConfigParameters(argv),
                            cookerdata.CookerConfiguration()):
                sys.exit(1)

        rootfs_dir = get_bitbake_var("IMAGE_ROOTFS", options.image_name)
        kernel_dir = get_bitbake_var("DEPLOY_DIR_IMAGE", options.image_name)
        native_sysroot = get_bitbake_var("STAGING_DIR_NATIVE",
                                         options.image_name)
    else:
        if options.build_rootfs:
            print "Image name is not specified, exiting. (Use -e/--image-name to specify it)\n"
            sys.exit(1)

    wks_file = args[0]

    if not wks_file.endswith(".wks"):
        wks_file = engine.find_canned_image(scripts_path, wks_file)
        if not wks_file:
            print "No image named %s found, exiting.  (Use 'wic list images' "\
                  "to list available images, or specify a fully-qualified OE "\
                  "kickstart (.wks) filename)\n" % args[0]
            sys.exit(1)

    image_output_dir = ""
    if options.outdir:
        image_output_dir = options.outdir

    if not options.image_name:
        rootfs_dir = ''
        if 'ROOTFS_DIR' in options.rootfs_dir:
            rootfs_dir = options.rootfs_dir['ROOTFS_DIR']
        bootimg_dir = options.bootimg_dir
        kernel_dir = options.kernel_dir
        native_sysroot = options.native_sysroot
        if rootfs_dir and not os.path.isdir(rootfs_dir):
            print "--roofs-dir (-r) not found, exiting\n"
            sys.exit(1)
        if not os.path.isdir(bootimg_dir):
            print "--bootimg-dir (-b) not found, exiting\n"
            sys.exit(1)
        if not os.path.isdir(kernel_dir):
            print "--kernel-dir (-k) not found, exiting\n"
            sys.exit(1)
        if not os.path.isdir(native_sysroot):
            print "--native-sysroot (-n) not found, exiting\n"
            sys.exit(1)
    else:
        not_found = not_found_dir = ""
        if not os.path.isdir(rootfs_dir):
            (not_found, not_found_dir) = ("rootfs-dir", rootfs_dir)
        elif not os.path.isdir(kernel_dir):
            (not_found, not_found_dir) = ("kernel-dir", kernel_dir)
        elif not os.path.isdir(native_sysroot):
            (not_found, not_found_dir) = ("native-sysroot", native_sysroot)
        if not_found:
            if not not_found_dir:
                not_found_dir = "Completely missing artifact - wrong image (.wks) used?"
            print "Build artifacts not found, exiting."
            print "  (Please check that the build artifacts for the machine"
            print "   selected in local.conf actually exist and that they"
            print "   are the correct artifacts for the image (.wks file)).\n"
            print "The artifact that couldn't be found was %s:\n  %s" % \
                (not_found, not_found_dir)
            sys.exit(1)

    krootfs_dir = options.rootfs_dir
    if krootfs_dir is None:
        krootfs_dir = {}
        krootfs_dir['ROOTFS_DIR'] = rootfs_dir

    rootfs_dir = rootfs_dir_to_args(krootfs_dir)

    print "Creating image(s)...\n"
    engine.wic_create(wks_file, rootfs_dir, bootimg_dir, kernel_dir,
                      native_sysroot, scripts_path, image_output_dir,
                      options.compressor, options.debug)


def wic_list_subcommand(args, usage_str):
    """
    Command-line handling for listing available images.
    The real work is done by image.engine.wic_list()
    """
    parser = optparse.OptionParser(usage=usage_str)
    args = parser.parse_args(args)[1]

    if not engine.wic_list(args, scripts_path):
        logging.error("Bad list arguments, exiting\n")
        parser.print_help()
        sys.exit(1)


def wic_help_topic_subcommand(args, usage_str):
    """
    Command-line handling for help-only 'subcommands'.  This is
    essentially a dummy command that doesn nothing but allow users to
    use the existing subcommand infrastructure to display help on a
    particular topic not attached to any particular subcommand.
    """
    pass


wic_help_topic_usage = """
"""

subcommands = {
    "create":    [wic_create_subcommand,
                  hlp.wic_create_usage,
                  hlp.wic_create_help],
    "list":      [wic_list_subcommand,
                  hlp.wic_list_usage,
                  hlp.wic_list_help],
    "plugins":   [wic_help_topic_subcommand,
                  wic_help_topic_usage,
                  hlp.get_wic_plugins_help],
    "overview":  [wic_help_topic_subcommand,
                  wic_help_topic_usage,
                  hlp.wic_overview_help],
    "kickstart": [wic_help_topic_subcommand,
                  wic_help_topic_usage,
                  hlp.wic_kickstart_help],
}


def start_logging(loglevel):
    logging.basicConfig(filname='wic.log', filemode='w', level=loglevel)


def main(argv):
    parser = optparse.OptionParser(version="wic version %s" % __version__,
                                   usage=hlp.wic_usage)

    parser.disable_interspersed_args()

    args = parser.parse_args(argv)[1]

    if len(args):
        if args[0] == "help":
            if len(args) == 1:
                parser.print_help()
                sys.exit(1)

    return hlp.invoke_subcommand(args, parser, hlp.wic_help_usage, subcommands)


if __name__ == "__main__":
    try:
        sys.exit(main(sys.argv[1:]))
    except WicError as err:
        print >> sys.stderr, "ERROR:", err
        sys.exit(1)

